一类6自由度Delta型机器人运动学分析
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福建省高校产学合作项目(2019H6006)


Kinematic Analysis of Novel 6-DOF Delta Robot
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    摘要:

    为满足工业机器人多角度操作需求,提出了一类具有3组耦合分支,且对称分布的6自由度Delta型机器人。首先,将每组耦合分支拆分为独立运动单元,并等效为串联运动链,基于旋量理论求出等效后的运动自由度;其次,利用闭环矢量回路法分别计算耦合分支中每条主动链的位置逆解,建立机器人的逆运动学模型;在此基础上,提出一种搜索算法,用于描绘满足边界条件的机器人运动空间,并与相同尺度参数的3自由度Delta机器人进行对比。结果表明,3自由度Delta机器人的运动空间是所提机器人工作空间的子集。最后,根据理论分析,完成了工程样机的搭建与运动实验,实验结果表明,该Deta型机器人具有6个自由度运动能力,且所提运动空间搜索算法具有较高的计算精度。

    Abstract:

    In order to meet the requirement of multi-angle operation in industrial pick-and-place applications, a novel six degree-of-freedom (DOF) Delta robot with three sets of symmetrically distributed coupled branches was proposed. Firstly, the 6-DOF Delta robot was decomposed into three sets of coupled branches, which can be regarded as independent motion units and can be further treated as equivalent serial chains. The mobility of the overall parallel mechanism was analyzed based on the screw theory to demonstrate that it had three rotational and three translational motion capabilities. Secondly, since each set of coupled branches contained two kinematic chain, the closedloop vector method was used to calculate the inverse position solution of two chain in the coupled branch, based on which an inverse kinematic model of the proposed robot was established. Furthermore, a search algorithm was proposed to describe the robot’s workspace under the boundary condition which was compared with that of a traditional 3-DOF Delta robot at the same parameter level. Simulation results showed that the workspace of a traditional 3-DOF Delta robot was a subset of that of the proposed 6-DOF Delta robot. Finally, the kinematic experiments were carried out on the engineering prototype, the results showed that the proposed robot had three degree-of-reedom of rotation and three degree-of-freedom translational motion, and can achieve multi-angle grabbing operation. In the robot workspace, the limit position of the typical motion plane was consistent with the simulation analysis results.

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张俊,许涛,方汉良,张良安.一类6自由度Delta型机器人运动学分析[J].农业机械学报,2020,51(3):419-426. ZHANG Jun, XU Tao, FANG Hanliang, ZHANG Liang’an. Kinematic Analysis of Novel 6-DOF Delta Robot[J]. Transactions of the Chinese Society for Agricultural Machinery,2020,51(3):419-426.

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  • 收稿日期:2019-07-19
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  • 在线发布日期: 2020-03-10
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